2. Trail Making Test Part A and Part B: Part A (3 minutes) of this measure (Army Individual Test Battery, 1944; Reitan & Wolfson, 1985) is a test of visual attention where the subjects must draw lines on a page connecting 25 consecutive number as quickly as possible. Part B (5 minutes) requires the subject to alternately sequence numbers and letters randomly distributed on a page into their ascending and alphabetical order as quickly as possible.